Measurement and control of electromagnetic interference
First Claim
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1. A method, comprising:
- continuously and simultaneously varying an electrical impedance at a plurality of termination locations between first and second substructures that radiate electromagnetic noise to continuously vary an amplitude of a component of the electromagnetic noise at a particular frequency.
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Abstract
The average EMR emissions of an electronic device may be reduced by implementing an electrically-active modulated termination. For example, the impedance may be continuously varied at one or more termination locations between two metal substructures to cause a like variation in the amplitude of each component of the EMR. According to one approach, cyclically varying the electrical impedance with a period of less than the time interval over which the EMR is measured will result in a reduction in the average measured EMR.
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Citations
13 Claims
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1. A method, comprising:
continuously and simultaneously varying an electrical impedance at a plurality of termination locations between first and second substructures that radiate electromagnetic noise to continuously vary an amplitude of a component of the electromagnetic noise at a particular frequency. - View Dependent Claims (2)
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3. A method, comprising:
continuously varying an electrical impedance at one or more termination locations between first and second substructures that radiate electromagnetic noise to continuously vary an amplitude of a component of the electromagnetic noise at a particular frequency, wherein the step of varying the electrical impedance at the one or more termination locations between the first and second substructures comprises flowing electrical current through one or more spaced-apart PIN diodes coupling the first and second metal substructures and varying the electrical current to vary a resistance of the PIN diodes.
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4. A method, comprising:
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continuously varying an electrical impedance at the one or more termination locations between first and second substructures that radiate electromagnetic noise to continuously vary an amplitude of a component of the electromagnetic noise at a particular frequency; receiving a portion of the electromagnetic noise within a selected bandwidth; and averaging an intensity of the received portion of the electromagnetic noise over a selected sampling interval, wherein continuously varying the electrical impedance includes cyclically varying the electrical impedance with a period of less than the sampling interval. - View Dependent Claims (5)
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6. An electronic system, comprising:
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a signal generator for generating an electronic signal; a first metal substructure and a second metal substructure electrically coupled to the electrical signal generator for radiating electromagnetic noise from the signal generator; and an impedance controller for continuously varying an electrical impedance at one or more termination locations between the two metal substructures to continuously vary the amplitude of a component of the electromagnetic noise at a particular frequency of the electromagnetic noise. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification